unexplained light formationwe were entering wagga wagga on the outskirts of town when we noticed three bright orange lights about 150-200ft high. These lights proceded to climb slowly to approx 400ft high and then move in a northerly direction in formation. We pulled the car to the side of the road to take a further look and as we watched they excellerated in speed from approx 90km/per hour to approx 200km/per hour at which time the formation began to change with 1 incresing to approx 3000ft and the other 2 stopping at approx 2000ft.While watching we had the car swithced off and no noise could be heared. I have an avid interest in aircraft and have been a mechanic for over 10 years and have never seen or heared of anything other than ufo's that can display this behaviour in complete silence.